Current research projects

Image Software modules
Image Cold meter
Image Certification of efficient air conditioning and ventilation systems through the new "indoor air quality seal" for non-residential buildings
Image Testing of mobile leak detectors according to DIN EN 14624
Image Corrosion inhibitor for ammonia absorption systems
Image Air-water heat pumps
Image Panel with indirect evaporative cooling via membrane
Image Combined building and system simulation
Image CFE-Test of Cooker Hoods
Image Innovative cryogenic cooling system for the recondensation / liquefaction of technical gases up to 77 K
Image Innovative Parahydrogen Generator Based on Magnets
Image Characterisation of Superconductors in Hydrogen Atmosphere
Image Energy efficiency consulting - cogeneration systems
Image Calibration of Low Temperature Sensors
Image Humidifier System for High-Purity Gases
Image State of system and failure analyses

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Calibration of Low Temperature Sensors

Industry and R&D

Dr. rer. nat. Matthias Schneider

+49-351-4081-5126

According to the comparative measurement method

Accurate and reliable measurements are the requirements for high-quality research and development or industrial production. Using the comparative measurement method the following sensors can be calibrated:

  • Resistance Temperature Detectors (RTD) with positive temperature coefficient (like Platinum or Rhodium-Iron RTDs)
  • RTD with negative temperature coefficient (like Germanium or Cernox™ RTDs)
  • Diode and thermocouples.

With an automatic measuring station several temperatures according to a sample point table will be adjusted. The calibration is carried out with secondary thermometers that are calibrated by an authority. Furthermore a fix point check with LHe or LN2 will be performed. In addition, a calbriated Cernox sensor is available for measurements in the low temperature range. The measuring facility allows the calibration of about 30 sensors at once. There are continuous extensions for different sensor types.

Parameter

IndicatorMinimalMaximal
Measuring range1.5 K350 K
Measuring accuracy5 mK (1.5 ... 4.2 K)50 mK (80 ... 350 K)
Sample dimensioncommon sensor packages
Sample preparationnot necessary

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Further Projects - Research and Development

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Innovative small helium liquefier

Liquefaction rates from 10 to 15 l/h

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Filter Tests

INDUSTRIAL AND LABORATORY PRECIPITATORS

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Low Temperature Tribology

Tribological studies at cryogenic temperatures

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Refrigerants, lubricants and mixtures

Determination of working fluid properties

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Reduction of primary noise sources of fans

...using numerical and experimental methods with contra-rotating axial fan